Thankful for this thread , set my Maxspect tank up this past week and could not figure out for the life of me what was causing all the micro bubbles in the tank. Thinking it was the skimmer, I used filter flosss etc before the pump and couldn’t see a single micro bubble in the sump. Started thinking it might be the return hoses taking in air then it hit me with the gyre having a lot of micro bubbles on the actual frame of the pump and looked it up and found this thread. Turned it off then back on a few min later and poof micro bible pretty much gone.